Association of Polymorphisms in X-Ray Repair Cross Complementing 1 Gene and Risk of Esophageal Squamous Cell Carcinoma in a Chinese Population

Table 2

Characteristics of esophageal cancer cases and controls.

Variables	Case N (%)	Control N (%)		P
Age
≤65	237 (62.2)	286 (66.2)	1.41	0.23
>65	144 (37.8)	146 (33.8)
Gender
Male	256 (67.2)	278 (64.4)	0.72	0.40
Female	125 (32.8)	154 (35.6)
Smoking^*
Nonsmokers	189 (59.6)	264 (61.1)	0.17	0.68
Smokers	128 (40.4)	168 (38.9)
Drinking^*
Nondrinkers	255 (80.7)	353 (81.9)	0.18	0.68
Drinkers	61 (19.3)	78 (18.1)
Family history of cancer^*
No	233 (75.6)	357 (85.2)	10.60	0.001
Yes	75 (24.4)	62 (14.8)

because of the failure data collection, the number of cases and controls for some factors was less than 381 or 432.